(19)

(11)

EP 4 048 980 A1

(12)

(43) Date of publication: 31.08.2022 Bulletin 2022/35 (21) Application number: 19949972.4 (22) Date of filing: 22.10.2019

(51) International Patent Classification (IPC):  G01C 21/34(2006.01) (52) Cooperative Patent Classification (CPC): G01C 21/3652; G01C 21/3461; G01C 21/3811 (86) International application number: PCT/CN2019/112592 (87) International publication number: WO 2021/077302 (29.04.2021 Gazette 2021/17)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (71) Applicant: Telefonaktiebolaget LM Ericsson (publ.) 16483 Stockholm (SE)	(72) Inventor: ZHANG, Ning Beijing 100102 (CN) (74) Representative: Ericsson  Patent Development Torshamnsgatan 21-23 164 80 Stockholm 164 80 Stockholm (SE)